Something like this? I saved some seeds.
Picked these up from a fruit stand today in Stuart, FL. Got about 8 Large ones for $3, genetically they seem to be mixed, perhaps collected from a semi wild patch (since this is a minor crop in FL)?
This one had a beet red flesh hard seeds with moderate amount of seeds. Sweet flavor with a hint of banana taste.
The second one had magenta flesh, hard seeds slightly smaller. Sweet with somewhat raspberry flavor, acidic component to taste especially the off white areas of the flesh.